Having collected another set of data from our familiar
This time a storm is coming up from the south, and so we will be running north to stay just out of its reach. I’m told by some of the locals on board that our weather during this cruise seems unseasonably cool and windy. Yet underneath this cool exterior, warmer waters are slowing pushing into the Tasman Sea. And that is where weather and climate do not always agree – until they do.

Current affairs
The East Australian Current (EAC) runs southward along the coast of eastern Australia, much like the Gulf Stream in the U.S. If the EAC sounds familiar, you can thank a little clownfish named Nemo
The role of eddies
As we’ve mentioned before, eddies are an important element in understanding how the energy of the internal tide beam may be dissipated as it moves across the Tasman Sea, or as it is reflected off the Tasman shelf. Circulating in either clockwise or counterclockwise directions, the eddies create shear that can disrupt the low mode internal wave into higher mode waves (with smaller amplitudes), which don’t propagate as far. So, just as the internal tide can affect climate models by contributing to the movement of ocean energy around the globe, so might climate change impact how the internal tide moves that energy by gradually increasing eddy formation in the Tasman Sea. In their efforts to understand how the internal tide system works under current ocean conditions, T-Beam scientists are planning to collect more information on how eddies interact with the internal tide. Perhaps these data may eventually help them also predict how this system could be affected by ongoing changes in the EAC and regional climate.

